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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2023
Mar. 18, 2024
Jun. 30, 2023
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Document Transition Report false    
Entity File Number 0-20852    
Entity Registrant Name ULTRALIFE CORPORATION    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 16-1387013    
Entity Address, Address Line One 2000 Technology Parkway    
Entity Address, City or Town Newark    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 14513    
City Area Code 315    
Local Phone Number 332-7100    
Title of 12(b) Security Common Stock, $0.10 par value per share    
Trading Symbol ULBI    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 46,718,255
Entity Common Stock, Shares Outstanding (in shares)   16,446,832  
Auditor Name Freed Maxick CPAs, P.C.    
Auditor Location Rochester, New York    
Auditor Firm ID 317    
Entity Central Index Key 0000875657    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false